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Oct 15, 2022 · To use standard laboratory measurement devices to measure length, volume and mass amounts. To use these measurements to determine the areas of shapes and volumes. To determine the density of water. To determine the density of a solid and use this to determine further quantities.
Sep 22, 2021 · Objectives. To use a metric ruler to measure the dimensions of regular geometric shapes, and to use these measurements to determine the areas of the shapes. To measure the volume of a sample of water using a graduated cylinder and a beaker in order to compare their precision.
- What Do We Mean by Accuracy and Precision?
- Is Any Measurement Ever Truly 100% Accurate and precise?
- 8 Ways to Improve Your Accuracy and Precision in The Lab
- Final Thoughts
You likely have a good understanding of the difference between accuracy and precision. Since accuracy and precision are fundamental to almost all the sciences, they are typically one of the first subjects covered in introductory STEM courses. With that said, let’s get a quick refresher before we proceed to the consequences of misunderstanding accur...
Here’s the bad news—while being 100% accurate and precise is clearly ideal, it is impossible in reality. There is alwayssome non-zero variability from factors outside our control, such as the instruments, environmental conditions, and lab personnel. With that said, there are many things we can do to maximize accuracy and precision when conducting e...
1. Keep EVERYTHING Calibrated!
Calibration is the number one item on this list for a very important reason: it is the MOST critical means of ensuring your data and measurements are accurate. Calibration involves adjusting or standardizing lab equipmentso that it is more accurate AND precise. Calibration typically requires comparing a standard to what your instrument is measuring and adjusting the instrument or software accordingly. The complexity of calibrating instruments or equipment varies widely, but, typically, user m...
2. Conduct Routine Maintenance
Even if all instruments in your lab are calibrated, odds are they need regular care to operate at their maximum accuracy and precision. For instance, pH meters need routine maintenancethat can be performed by novice scientists, while more sensitive instrumentation may require shipment of parts to vendors or even on-site visits. Again, check your user manuals and call equipment manufacturers to ensure you take appropriate measures to keep lab equipment running under conditions optimal for accu...
3. Operate in the Appropriate Range with Correct Parameters
Always use tools that are designed and calibrated to work in the range you are measuring or dispensing. For example, don’t try to measure OD600 beyond an absorption of >1.0since optical density (OD) readings this high are beyond the dynamic range of most spectrophotometers! If you are ever unsure about using an instrument to measure accurately at an extreme value, reach out to a trusted peer or mentor for advice. What if you are choosing between two tools that are both calibrated for use at a...
There are a wealth of resources on these topics if you want to learn more. For a more statistics-based primer on accuracy, precision, and trueness, check out Artel’s resource library on these topics. You might also consider reading about accuracy and precision through the International Organization of Standardization, which is a global organization...
Nov 2, 2023 · 1 minute = 60 seconds. Temperature is measured with a thermometer or digital probe. Laboratory thermometers usually have a precision of a half or one degree. Digital temperature probes are available which are more precise than traditional thermometers and can often read to 0.1 o C.
Know Your Techniques: Accuracy, Precision, and Using the Right Instrument. By Amanda J. Carroll | December 07, 2022. You’re in the lab and need to prepare a sample. Do you use a volumetric flask or an Erlenmeyer? The analytical balance or a top-loader? What about pipettes? Choosing the right equipment is the first step in a successful experiment.
You often need to combine laboratory measurements mathematically, such as subtracting the mass of an empty flask from a full flask to find the mass of liquid it contains. There are two simple calculation rules for significant figures.
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The metric system is used almost exclusively in the sciences, and the SI or System International, has been adopted as the standard measurement system. The meter, kilogram, and second are the basic units for length, mass, and time.
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